Bumpek sack



'15, 1936. 1 1:).I NlLsON BUn/11313K JACK Filed Sept. 10, 1935 wwf/bf-Zeawfd Z2 27Min/1^' WZJGJMM @Patented ec. E59 i936 20 isi/ps,

An object of my invention is to provide a' bumper jack which is simple,durable and comparatively inexpensive to manufacture.

More particularly it is my object to provide a jack structure ofpost-like construction having an operating member extending from one endthereof and reciprocable toward and awayfrorn the post-like member,lifting means being provided which is vertically slidable on thepost-like member and has one or more projections for engaging the bumperof an automobile for lifting the bumper and thereby one end of theautomobile.

Heretofore jacks have been made which set under the axles of theautomobiles and some of these have extension operating means making themmore convenient for operating the jack from a convenient position remotefrom the jack itself. Present day automobiles'are constructed withconsiderable over-hang of the body relative to the axles and it istherefore quite dimculh. especially when balloon tires are used and havebeen punctured, to get a jack properly' positioned under the axle andstill be able to operate the jack from a comfortable position withoutgetting ones clothes dirty and experiencing other dimculties. My presentinvention accordingly is designed to eliminate the necessity for placinga jack under the axle, the jack being cooperable with the bumper of theautomobile which is aly Ways located at the extreme end thereof and thejack being suinciently powerful to lift either one l entire end of thecar or one corner thereof as de- A further object is to provideoperating means for the jack which is in a convenient position formanipulation, specifically, extending from the upper end of thepost-like jack and vertically reciprocable for the lifting operation.

A further object is to provide a jack which has a considerable range ofmovement, one which is readily positioned and may be quickly-adjusted tothe bumper or other projection with which it engages and can thereafterbe conveniently operated in a standing position for lifting the bumper.

Another object is to provide the lifting mechanism of the jack in theform of a lifting piston and a hydraulic pump and to provide readily op#erable release means permitting lowering of the jack without anymanipulation thereof, other than opening a release valve.

With these and other objects in view, my invention consists in theconstruction, arrangement and combination of the various parts of mydevice, whereby the objects contemplated are attained, as hereinaftermore fully set forth, pointne JACK vlbeoinard D. Nilsen, Wayzata,Application september 1o, 193s, sei-iai No. 39,929

(ci. 25e-93) ed out in my claims and illustrated vin the accompanyingdrawing, in which:

-Figure 1 is a. side elevation of a. bumper jack structure embodying myinvention and showing it cooperating with a bumper bar.

Figure 2 is an enlarged sectional view on the line 2 2 of Figure 1showing the lifting means Figure 'I shows a modied form of load sup`port. Y

On the accompanying drawing,-I have used the reference numeral l0 toindicate a. base or foot for my jack structure. It is provided with up`struck perforated ears l2 'through which a pivot pin lli extends. Thepin also extends through a i lower cylinder head I6 'of aliftingcylinder i8. The lifting cylinder i8 is enlarged at its upper end toform a reservoir 2D and the upper end is provided with a head 22anda-packing nut 2li.

Within the lifting cylinder I8 l'provide a cup' leather lifting piston26 connected with a tubular lifting piston rod 28. The upper end of therod 28 extends through the packingnut 2d and is yconnected by locknuts3B to a yoke 32; The

arms of the yoke indicated -at 32a extend downwardly outsidethereservoir 2li and are hooked at their lower ends as indicated at 434.The hooks enter vslots 36 `of a tubular lifting member 38 wherebyraising movement of the lifting piston l26 and its rod 28 will raise theyoke 32 and conse'- quently the lifting member 38.

The internal diameter of the member 38 is substantially the same astheexterior diameter of the reservoir 20 to provide a sliding tlescopingconnection between these two members. Below the reservoir 20 the.lifting cylinder I8 is provided with a plurality of guide strips 80which provide a. four point guide as shown in Figure 6 fox-,all or thelportion of the tubular lifting member 3 8 when'in aposition extendingbelow the reservoir 20. o

The lifting member 38 is provided with a. pair of hook-like projections42 and 44. One of these is adapted to engagea bumper bar 46' of anautomobile or any other device to be raised by the Jack structure. f

From the foregoing description, it will be 'obvious that the liftingmember 88 can be raised ton. For this purpose, I provide a pump com--prising a pump cylinder 48, a plunger rod 50, intake valves 52 and anoutlet valve 55. The intake valves are gravity seated while the outletvalve is seatedby a spring 56. The plunger et has an enlarged rod-likeextension or operating rod et to provide sufficient strength to preventbending, the plunger itself being quite small to secure the requireddiierential of diameter between the pump plunger 5D and the liftingpiston 2B.

The upper end of the operating rod extends from the upper end of thetubular lifting piston 2S through a packing nut 60 and terminates in anoperating lrnob 62. Upon reciprocation of the knob 62 upwardly, oil willbe drawn from the reservoir 2li, through the check valves 52 into thepump cylinder M3. On the down stroke, this oil will be forced throughthe outlet check valve te and raise the lifting piston a distancecorresponding to the volume of oil pumped through the valve et. Thus bya number of reciprocations the bumpers 4t will be raised step by step.

With the jack structure in the lowered posi-z tion, it is nrst placedadjacent the bumper and the yoke 32 then grasped and pulled upwardlywhich causes flow of oil through the check valves 52 and 54 so that thejack may be raised by hand to contact with the bumper. Thereafter thejack may be pumped up for the lifting operation. This eliminates thetedious operation of pumping to bring the jack up from its loweredposition to bumper contacting position and enables the operator to raiseit to this position in a minimum of time.

After the jack is raised, it will stay in raised position, the valves 52and 54 holding theV oil against return movement.

Such return movement is required for lowering the jack and may beaccomplished by releasing means which I will now describe:

. Means is provided for by-passing the return oil past the valves 52instead of unseating them and comprises a valve plug 66 secured to thepump cylinder 48. This plug normally seats as in Figure 2 against thelower end of the tubular piston rod 28 so as to prevent any oil leakagepast this point.

The lower end of the pump piston 48, it will be noted, is threaded ina'tting I8 which connects the lower end of the tubular piston rod 28with the lifting piston 26. l

The upper end of the pump piston '48 is provided with a head 10 having aplurality of notches 12. The operating rod 58 is provided with a head 14having a plurality of lugs 16 adapted to enter the notches 12 when therod 88 is radjacent its innermost position as shown in Figure 2.

Thereupon the knob 62 can be rotated for rotating the cylinder 48 andcausing it to move` longitudinally downward as in Figui-e3 to open thevalve lplug 86 and to engage and open the valve I4. The oiimay thereuponflow past the valve and enter the bore of the cylinder 48 throughnotches in the lower end thereof, and then through passages 18 (seeFigure 3) and past the valve 66 and through an opening 80 to thelcylinder i8 above the piston 26 and to the reservoir 20.

By this arrangement the singleknob 82 serves both as a lifting means andas a lowering means by reciprocations and rotations respectively. Thespeed of lowering, of course, can be nicely governed by the degree ofopening of the valves 5d and 66. Y

After the valve 54 is 0H its seat, the lugs lit of the head 14 will bemeshed deeper with the notches '12 causing a pin-like extension 6d onthe lower end of the piston rod 50 to move the valve 6d further from itsseat. This cannot be done 'while the valve 56 is on its seat due to thepressure of oil holding the valve against its seat, but after the valveis unseated the pressure is equalized, thereby permitting a downwardmovement of the knob 62 to open the valve further for quick loweringwithout exerting undue eort to push the valve further open.

In Figure '7 I show a modified construction in which a sleeve 38a issubstituted for the sleeve Sii and has a movable ring 62a provided witha lug Mia, thus providing an adjustable hook on the lifting sleeves 38a.The surface of the tube 381i is preferably slightly corrugated so as toaid in the binding action of the ring 52a on the sleeve after the ringis adjusted to the desired height thereon.

It will be noted that all operating parts of the jack are in a straightline. This produces compactness without any projecting operating partsto be interfered with by parts of the automobile, inasmuch as partsabove the bumpers of automobiles are always clear.

The elongated arrangement of the jack permits a considerable range ofmovement, the piston 26 being movable from adjacent the head i6 toadjacent the bottom of the reservior 2t. By enlarging the cylinder I8-toform the reservoir-253 the upper end of the cylinder i8 can be extendedto the maximum height yet provide sufficient capacity in the reservoirfor displacement caused by the tubular piston rod 28. Theguide stripsdi) effectively guide the tubular lifting member 38 in its lowerpositions, the upper end thereof being finally guided by the reservoir20 and capable of extending to a position thereabove whenthe jack is inits extreme raised position. The foot, being pivoted, can-be swung tothe dotted position of Figure 1 when storing the jack in the tool box soas to reduce the room required for the jack to a minimum.

Some changes may be made in the construction and arrangement of theparts of my device without departing from the real spirit and purpose ofmy invention and it is my intention to cover by my claims any modifiedforms oi' structure or use of mechanical equivalents which may bereasonably included within their scope.

I claim as my invention:

1. In a bumper jack, a vertical cylinder, bumper engaging means slidablethereon and having means at the side of said cylinder forsupporting abumper, lifting means within said cylinder and having a portionprojecting above the upper end thereof, a yoke connection between saidportion and said bumper engagingmeans to raise the bumper engaging meanswhen the lifting means is operated and operating means for said liftingm'eans having a vertically reciprocable handle extending out-of theupper end of said portion.

2. In a bumper jack, a vertical cylinder, bumper engaging means slidablethereon and having means for supporting a bumper, lifting means withinsaid cylinder and having a portion projecting above the upper endthereof, a yoke con- In a jack of the character described, a verlnection between said portion and said bumper'en-v gaging means to raisethe bumper engaging means when the lifting means is operated andoperating means` for said lifting-means having a vertically reciprocablehandle extending out of theA upper end of said portion, means to releasesaid lifting means to permit lowering thereof, said handle beingmanipulatable to operate said release means.l

`3. In a bumper jack, a vertical cylinder, a tubular element slidablethereon and having a hook projecting radially therefrom for supporting abumper, a lifting piston within said cylinder and having a piston rodprojecting above the upper end thereof, an'operative connection betweensaid portion and said bumper engaging means to raise the means when oilis pumped to the lifting piston and a pump for so pumping oil andhavinga vertically reciprocable handle `extending above the upper end of saidportion. fl. In a bumper jack, a vertical cylinder, bumper engagingmeans slidable thereon and having means for supporting a bumper, alifting piston within said cylinder and havinga piston rod projectingabove the upper end thereof, an operative connection between saidportion and said bumper engaging means to raise the means when oil ispumped to' the lifting piston and a pump within said piston rod for so'pumping oil, said plnnp having an' operating rod extending from theupper end of said piston rod and surmounted by an op-S erating knob.

5. In 'a bumper jack, a vertical cylinder, bumper engaging meansslidable Athereon and having means for supporting a bumper, a liftingpiston within said cylinder and having a piston rod proj ecting abovethe upper end thereof, an operative connection between said portion andsaid bumper engaging means to raise the means when` oil is pumpedto thelifting piston and a pump within said piston rod `for so `pumping oil,said pump having an operating rod extending from the upper end of saidpiston rod, release means for said calv cylinder, a -lifting memberslidable longitulifting piston, said operating rod being associatedtherewith to operateithe release means when it is desired to permit thejack to lower. I

6. In a jack of the character described, a vertical cylinder, .aliftingm'ember slidable longitudinally relative thereto, liftingmeanswlthin said cylinder and projecting thereabove, lowering meanscarried by said lifting means, an operative connection between theprojecting part of said lifting means and said lifting member and meansfor operating said lifting means and said lowering means and having ahandle projecting from said projecting part. l

7. vIn a jack of thecharacter described, a vertical cylinder, a liftingmember slidable longitudinallyrelative thereto,.lifting' meanswithinsaid cylinder and-'projecting thereabove, an operative connectionbetween the projecting part-thereof y and said lifting ,member and .asingle control member for lifting and lowering said lifting means andhaving an operating handle projecting out 4of the top of said projectingpart.

8. In a jack of the character described, a vertiv`dinally relativethereto, lifting means within said cylinder and projecting thereabove,an operative connection between the projecting part lifting and loweringsaid lifting means and having an operating handle projecting from saidprojecting part, said operating handle being reciprocable 4forliftingoperations and rotatable for loweringoperations.

tical cylinder, a lifting member slidable longitudinally relativethereto, lifting means within said cylinder, said lifting'meanscomprising a lifting piston, a tubular pistcn rod extending upwardlytherefrom and from the upp'er end of said cylinder, an' operativeconnection between the upper end of said tubular piston rod and saidlifting I member, a pump within said tubular piston rod for pumpingoilfrom the cylinder above the lifting piston to the cylinder below thelifting piston and an operating member for said pump extending from theupper end of said tubular piston rod.

10. In a jack of the character described, a vertical cylinder, a liftingmember slidable longitudinally relative thereto, lifting means withinsaid cylinder, said lifting, means comprising a lifting piston, atubular piston rod extending upwardly therefrom and from the upper endof -said cylinder, an operative connection between the upper end of saidtubular piston rod and said lifting member, a pump within said tubularpiston rod for pumping'oil from the cylinder above the lifting piston tothe cylinder below the lifting piston and an operating member for saidpump extending from the upper end of said tubular piston rod andcomprising a pump piston rod and a knob on the upper end thereof.

11. -In a jack of the lcharacter described, a vertical cylinder, alifting member slidable longitudinally relative thereto, lifting meanswithin said cylinder,` saidlifting means comprising a lifting piston, atubular piston rod extending `up` wardly therefrom and out of the upperend of said' cylinder; an operative connection between the upper end ofsaid tubular piston rod and-said lifting member, a pump within saidtubular pistical cylinder, a lifting member slidable longitudinallyrelative thereto, lifting means within said` cylinder, said liftingmeanscomprising a lifting piston, a tubular piston rod extendingupwardly therefrom and from'the upper end of said cylinv der, anoperative connection between the upper end of said tubular'piston rodand said lifting member, a pump within said tubular piston rod forpumping oil from the cylinder above the lifting piston to the cylinderbelow the lifting piston, an operating member for said pump extendingfrom the upper end of said tubular piston rod and comprising a .pumppiston rod and a knob on the upper end thereof, said pump includingrelease lmeans to permit oil to. flow from below the lifting piston tothereabove and means to 'render said release means operative, said lastmeans comprising an operative connection be- -tween the pump piston rodand the release means Awhereby' the release means may be operated by. I,

,Y/manipulation of said pump piston rod. Y V"rlileln a jackof thecharacter described, a ver-l thereof and said lifting member and meansfor said cylinder, an operative connection'between 755 4 the upper endof said tubular piston rod and said lifting member, a pump within saidtubular piston rod for pumping oil from the cylinder above rthe liftingpiston to the cylinder belowthe liftto thereabove and means to rendersaid release means operative, said last means comprising an operativeconnection between said pump piston rod and said release means wherebythe release means may be operated by rotation of the pump piston rod.

14. In a. device of the class described, a vertical cylinder, anelongated pivoted foot on the base thereof adapted to exten-d either atright angles thereto or parallel therewith, bumper engaging meansslidable thereon and having means for supportinga bumper, a liftingpiston within said cylinder and having a piston rod projecting above theupper end thereof, an operative connection between said portion and saidbumper engaging means to raise the means when oil is pumpe-d toA thelifting piston and a pump for so pumping oil and having a verticallyreciprocable handle extending out of the upper end of said portion.

15. In a device of the class described, a vertical cylinder, a. tubularlifting member slidable thereon, a ring slidable relative to an-dbindable on said tubular lifting member and having a hook-likeprojection to engage an automobile bumper or the fiike, lifting meanswithin said cylinder and projecting thereabove, an operative connectionbetween the projecting part thereof and said lifting member and meansfor operating said lifting means and having a handle projecting fromsaid projecting part.

16. In a -device of the class described, a vertical cylinder having a'nenlarged reservoir portion at its upper end, guide means below saidreservoir portion of substantially the same diameter as the outsidediameter of said reservoir portion, a tubular lifting member verticallyslidable on said guide means an-d reservoir portion, lifting meanswithin said cylinder comprising a lifting piston, a tubular piston rodextending upwardly at one end from the upper end of said cylinder, anoperative connection between the upper end of said tubular piston rodand said lifting member, a pump within said tubular piston rod forpumping oil from the reservoir cylinder above the lifting piston to thecylinder below the lifting piston and an operating member for saidpump-v extending from the upper end of said tubular piston rod.

17. In a jack of the character described, a vertical cylinder, a liftingmember slidable longitudinally-relative thereto, lifting means withinsaid cylinder, said lifting means comprising a lifting piston, a tubularpiston rod extending upwardly therefrom and from the upper end of saidcylinder, an operative connection between the upper end of said tubularpiston rod and said lifting member, a pump within said tubular pistonrod for pumping oil from the cylinder above the lifting piston to thecylinder below the lifting piston, an operating member and release meansfor said pump extending from the upper end of said tubular piston rod,and a coupling connection between said pump piston rod and said releasemeans, the release means being operated upon rotation, said couplingconnection being operable upon said pump piston rod being moved to onelimit of its reciprocatory movement.

18. In a jack of the character described, a vertical cylinder, a liftingmember slidable longitudinally relative thereto, lifting means withinsaid cylinder, said lifting means comprising a lifting piston, a tubularpiston rod extending upwardly therefrom and from the upper end of saidcylinder, an operative connection between the uoper end of said tubularpiston rod and said ing member, a pump within said tubular piste-1 rodfor pumping o-il from the cylinder above the lifting piston to thecylinder below the lifting piston, an operating member for said pumpextending from the upper end bf said tubular piston rod and comprising apump piston rod and knob on the upper end thereof, said pump includingvalve means to permit, when open, oil to new from below the liftingpiston to thereabove and means to open said valve means.

19. In a device of the class described, a vertical cylinder, liftingmeans ine-rein and projecting therefrom, a vertically reciprocableoperating member for said lifting means, a lifting member slidablelongitudinally on said cylinder, an operative connection between saidlifting member and said lifting means and operating means for saidlifting means extending out of the upper end thereof.

20. In a jack of the character' described, a vertical cylinder, alifting member slidable longitudinally relative thereto, lifting meanswithin said cylinder and projecting thereabove, an operative connectionbetween the projecting part thereof and said lifting member and meansfor lifting and lowering said lifting means and having an operatinghandle projecting from said projecting part, said operating handle beingmovable one way for lifting operations and movable a different way forlowering operations.

vLEONARD D. NILSON.

